MUTANT PROTOPORPHYRINOGEN OXIDASE IN TOBACCO MITOCHONDRIA AND CODING GENE AND USE THEREOF

Disclosed are a mutant protoporphyrinogen oxidase in tobacco mitochondria and a coding gene and a use thereof. The mutant is a protein derived from SEQ ID NO: 1 by subjecting， a non-polar amino acid of at least one position of position 353， position 356 and position 372 in an amino acid sequence depicted by SEQ ID NO: 1， to substitution， deletion or addition of one or more amino acids without altering enzyme activity. Encoding the mutant gene into a target plant enables the target plant to acquire a resistance to a PPO enzyme inhibitor (herbicide) without overly affecting a catalytic activity of the enzyme. Therefore， the mutant and the coding gene thereof are useful for cultivating a plant with herbicide resistance.